Top-roll-grinding machine



J@ I'. NCI-IOLS.

TOP ROLL GRINDING MAGHINB.

Patented Mar. 17, 1891.

(No Model.)

WITNEEIE.'

f Mf) UNITED STATES PATENT GEEICE.

JOI-1N F. NICHOLS, OF FALL RIVER, HASSACI'IUSI'FTS.

TOP-ROLL-GRINDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 448,300, dated March 1'?, 1891.

Application tiled November 28, 1890- Serial NoA 372,819. (No model.

To all whom it may concern.-

Be it known that I, JOHN F. lTicHoLs, of the city of Fall River, in the county of Bristol and State of Massachusetts, have invented certain new and useful Improvements in Top- Roll-Grinding Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

This invention has vreference to improve ments in mechanism for grinding the drawing-surfaces of top rolls, which are formed of metal rolls covered with leather or similar material, the object being to produce a mechanism which will grind the surface of the rolls in such a manner as will insure a perfect cylindrical surface parallel with the line of the axis of the rolls.

The invention consists iu the novel features of construction of the grinding-machine and their combination with any ordinary form of a back-geared lathe, as will be more fully set forth hereinafter, and pointed out in the claims.

Figure 1 is a view of an ordinary backgeared lathe with the grinding mechanism attached thereto. Fig. 2 is an enlarged side view of the grindingdevice, showing the grinding-wheel in contact with the top roll.

Similar numbers of reference designate corresponding parts throughout.

In the drawings, S designates the lower part of a case provided with the chute 4 and cup 5 and supported by the brackets 6, which are secured to a plate adj ustably fitted to the slide-rest 7. In the upper ends of the brackets 6 is journaled the shaft 8, which carries the grinding-wheel 9 andis supplied with the small pulley S. The wheel 9 is provided with a removable section 10, which is secured to the main portion of the wheel by the screw 11 and thumb-nut 12. The case 3 is provided with a hinged cover 13, which has a projecting lip to extend over the top roll la when the cover is closed. Motion is imparted to the grinding-wheel 9 by means of a belt 15, working on the pulley 8 and driven from a drum 16, which is of a length equal to the length of the top rolls and has a diameter considerably greater than the diameter of the pulley S. The grinding-surface of the wheel 9 is formed of a strip of sand-paper or other suitable material. In securing the grindingsurface to the wheel the section 10 is first removed. The strip of sand-paperis then placed around the wheel and the ends turned into the opening formed by the removal of the section 1 0. A shorter strip of sand-paper is then placed over the face of the section 10 and the ends bent over the ends of the section. The section 10 is now replaced in the wheel 9 and screwed in place by means of the screw 11 and nut 12, stretching the strips of sand-paper tightly over the face of the wheel 9 and section 10.

The operation of the improved grinding de- Vice is as follows: The top rolls 14 are first centered and secured in the lathe. The plate forming the base for the brackets 6 is then fastened to the slide-rest 7 in a position to bring the grinding-wheel against the surface of the top roll, as shown in Fig.2. The sliderest 7 is now thrown into gear with the wormgear of the lathe and motion is imparted to the shaft carrying the lathe-driving pulley and the drum 16, from which the motion is conveyed by belts to the lathe-pulley and to the grinding-wheel, thus turning the top rolls 14 and grinding-wheel 9 in the same direction, but at different speeds, while the grinding device is carried by the slide-rest along the entire length of the top rolls in a line directly parallel with the line of their axes, the belt -15 being moved along over the drum 16 at the same time. During the grinding operation the dust and particles of leather are caught in the cup 5 and are carried by the current of air created by the grinding-wheel to the chute 4, being t-hus conveyed away from the top roll.

I have found in practice that the above mechanism for grinding top rolls will produce a more perfect drawing-surface, which will necessarily be parallel with the axis-line of the rolls.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a grinding-machine for top rolls, the combination, with a lathe in which the top rolls are centered and secured, of a grinding mechanism contained in the case 3, having IOO the cover 13 and provided with the cup 5, lect the particles ground therefrom and a chute 4, and brackets 6 6, by which it is supchute through which the particles are con- 1o ported on :i plate secured to the slide-rest of Veyed, as described. the lathe, as and for the purpose described. JOHN F 2. In a grinding-machine for top rolls, E case formed in two parts to contain zt grinding-wheel and furnished with a cup projecting under the top roll during` grinding to c01- NICHOLS.

Witnesses:

HENRY J. MILLER, J. A. MILLER, J r. 

